 /*******************************************************************************
  * Copyright (c) 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  ******************************************************************************/

 package org.eclipse.ui.internal.navigator.extensions;

 import java.lang.ref.SoftReference ;

 /**
  * @since 3.3
  *
  */
 public class EvalutationReference extends SoftReference {

     private final int hashCode;

     private final Class type;

     /**
      * @param referent
      * The object to be referenced
      */
     public EvalutationReference(Object referent) {
         super(referent);
         hashCode = referent.hashCode();
         type = referent.getClass();
     }

     /*
      * (non-Javadoc)
      *
      * @see java.lang.Object#hashCode()
      */
     public int hashCode() {
         return hashCode;
     }

     /*
      * (non-Javadoc)
      *
      * @see java.lang.Object#equals(java.lang.Object)
      */
     public boolean equals(Object obj) {
         if (obj == null)
             return false;
         else if (obj instanceof EvalutationReference) {
             if (!type.equals(((EvalutationReference) obj).type))
                 return false;
             return hashCode == obj.hashCode();
         }
         return false;
     }
     
     /* (non-Javadoc)
      * @see java.lang.Object#toString()
      */
     public String toString() {
         Object referent = get();
         if(referent == null)
             return "Evalutation[type="+ type +"]"; //$NON-NLS-1$//$NON-NLS-2$
 return "Evalutation[referent="+ referent +"]"; //$NON-NLS-1$ //$NON-NLS-2$
 }

 }

